The greatest factor of stability of the hip joint comes from:
The size of the femur
The size of the muscles associated with the joint
The amount of articular cartilage at the end of the head of the femur
The depth of the acetabulum
The Correct Answer is D
Choice A reason: While the femur is a large and strong bone, its size alone does not contribute significantly to joint stability. Stability is more dependent on the structural configuration of the joint and surrounding tissues.
Choice B reason: Muscles around the hip joint, such as the gluteals and iliopsoas, contribute to movement and dynamic stability, but they are not the primary factor in maintaining joint integrity under load.
Choice C reason: Articular cartilage provides a smooth surface for joint movement and helps reduce friction, but it does not significantly enhance joint stability. Its role is more about cushioning and facilitating motion.
Choice D reason: The depth of the acetabulum is the most critical factor in hip joint stability. This deep socket securely houses the head of the femur, forming a ball-and-socket joint that resists dislocation and supports weight-bearing activities. The acetabular labrum further deepens the socket and enhances stability.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A reason: Creatine phosphate does not interact directly with myosin. Its role is in energy storage and transfer, not in forming structural compounds with contractile proteins.
Choice B reason: ATP is broken down to ADP during muscle contraction, but creatine phosphate does not perform this breakdown. Instead, it helps regenerate ATP from ADP.
Choice C reason: This is the correct answer. Creatine phosphate stores high-energy phosphate groups and donates them to ADP to rapidly regenerate ATP during short bursts of intense muscular activity.
Choice D reason: Creatine phosphate does not form compounds with actin. Its function is metabolic, not structural.
Choice E reason: While ATP binding and hydrolysis induce conformational changes in myofilaments, creatine phosphate itself does not directly cause these changes. It supports ATP regeneration.
Correct Answer is D
Explanation
Choice A reason: Actin is a structural protein that forms the thin filaments in muscle fibers. It interacts with myosin during contraction but does not bind calcium directly or initiate contraction.
Choice B reason: Tropomyosin is a regulatory protein that blocks the myosin-binding sites on actin in a relaxed muscle. It shifts position when calcium binds to troponin, but it does not itself bind calcium.
Choice C reason: Titin is a large elastic protein that helps maintain the structural integrity of the sarcomere and contributes to passive elasticity. It does not function as a calcium receptor.
Choice D reason: Troponin is the correct answer. It is a regulatory protein complex that binds calcium ions during muscle contraction. This binding causes a conformational change that moves tropomyosin away from actin’s binding sites, allowing myosin to interact with actin and initiate contraction.
Choice E reason: Dystrophin is a structural protein that connects the cytoskeleton of muscle fibers to the extracellular matrix. It plays a role in muscle integrity but does not bind calcium or regulate contraction.
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